[libcxx-commits] [libcxx] feat libcxx: avoid defining std::nullptr_t in terms of ::nullptr_t (PR #73442)

[S. B. Tam via libcxx-commits]

cpplearner wrote:

`::nullptr_t` should be found in libc++'s `<stddef.h>`, regardless of what glibc's `<stddef.h>` does.

https://github.com/llvm/llvm-project/blob/9ba74c2ee044381544c8e1e736c4c85a1a9d56bf/libcxx/include/stddef.h#L49-L51


https://github.com/llvm/llvm-project/pull/73442